Ethan forgot the five-digit code to the lock on his briefcase. However, he did remember that the first digit is 6 and the last digit is either 8 or 4. The middle digits could be any number from 0 through 9 inclusive. What is the greatest number of five-digit codes Ethan might have to try in order to to open his briefcase?
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Home » Mathematics » Ethan forgot the five-digit code to the lock on his briefcase. However, he did remember that the first digit is 6 and the last digit is either 8 or 4. The middle digits could be any number from 0 through 9 inclusive.